/Engine/Source/Runtime/Core/Public/GenericPlatform/GenericPlatformFile.h
Only works for files on disk and currently only implemented for Windows.
true if the file's mark of the web status was successful changed, false otherwise.
virtual bool SetMarkOfTheWeb ( FStringView Filename, bool bNewStatus, const [FString](API\Runtime\Core\Containers\FString) * InSourceURL )